Stochastic Geometry Based Analysis of Capacity, Mobility and Energy Efficiency for Dense Heterogeneous Networks

Abstract

We consider different approaches for capacity enhancement of the network. In the first approach, using stochastic geometry we theoretically analyze time domain inter-cell interference coordination techniques in a two-tier HetNet and optimize the parameters to maximize the capacity of the network. In the second approach, we consider optimization of the locations of aerial bases stations carried by the unmanned aerial vehicles (UAVs) to enhance the capacity of the network for public safety and emergency communications, in case of damaged network infrastructure. In the third approach, we introduce a subsidization scheme for the service providers through which the network capacity can be improved by using regulatory power of the government. Finally, we consider the approach of device-todevice communications and multi-hop transmissions for enhancing the capacity of a network.v Velocity estimation of high speed mobile users is important for effective mobility management in densely deployed small cell networks. In this research, we introduce two novel methods for the velocity estimation of mobile users: handover-count based velocity estimation, and sojourn time based velocity estimation. Using the tools from stochastic geometry and estimation theory, we theoretically analyze the accuracy of the two velocity estimation methods through Cramer-Rao lower bounds (CRLBs).With the dense deployment of small cells, energy efficiency becomes crucial for the sustained operation of wireless networks. In this research, we jointly study the energy efficiency and the spectral efficiency in a two-tier HetNet. We optimize the parameters of inter-cell interference coordination technique and study the trade-offs between the energy efficiency and spectral efficiency of the HetNet.vi

Deployment of Drone Base Stations for Cellular Communication Without Apriori User Distribution Information

“…Meanwhile, ground transportations are often blocked in such emergency situations, which prevents emergency communication vehicles from getting close to the disaster area. In this case, high-altitude base stations can be used to provide emergency communications in the disaster area, where communications play a critical role in saving lives [1]. With recent advancements in drone technology, construct the high-altitude base stations by utilizing drones to carry the communication load for cellular networks has attracted considerable attention [2].…”

“…The endurance (flight time) is one of the critical challenges to the feasibility of drone-BSs. In December 2017, a record of four hours and forty minutes in self-powered drone's endurance was claimed by a European drone manufacturer company 'Quaternium' 1 . Additionally, an architecture that consists of * This work was supported by the Australian Research Council.…”